I’ve had this question back when i was in school.
You have to calculate at regular price.
4 x 9.75 = 39
Subtraction time. 10 people are renting, 4 are members
10 - 4 = 6
6 that are nonmembers. 4 members
6 x 3.95 = 23.70
4 x 2.95 = 11.80
Add all those up.
39 + 11.80 + 23.70 = 50.80 + 23.70 = 74.50
Answer: $74.50 :)